mirror of
https://github.com/mozilla/gecko-dev.git
synced 2024-11-13 23:17:57 +00:00
39 lines
998 B
C++
39 lines
998 B
C++
/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
|
|
/* This Source Code Form is subject to the terms of the Mozilla Public
|
|
* License, v. 2.0. If a copy of the MPL was not distributed with this
|
|
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
|
|
|
|
/* Implementations of hash functions. */
|
|
|
|
#include "mozilla/HashFunctions.h"
|
|
#include "mozilla/Types.h"
|
|
|
|
#include <string.h>
|
|
|
|
namespace mozilla {
|
|
|
|
uint32_t
|
|
HashBytes(const void* aBytes, size_t aLength)
|
|
{
|
|
uint32_t hash = 0;
|
|
const char* b = reinterpret_cast<const char*>(aBytes);
|
|
|
|
/* Walk word by word. */
|
|
size_t i = 0;
|
|
for (; i < aLength - (aLength % sizeof(size_t)); i += sizeof(size_t)) {
|
|
/* Do an explicitly unaligned load of the data. */
|
|
size_t data;
|
|
memcpy(&data, b + i, sizeof(size_t));
|
|
|
|
hash = AddToHash(hash, data, sizeof(data));
|
|
}
|
|
|
|
/* Get the remaining bytes. */
|
|
for (; i < aLength; i++) {
|
|
hash = AddToHash(hash, b[i]);
|
|
}
|
|
return hash;
|
|
}
|
|
|
|
} /* namespace mozilla */
|